Power transmission



Nov. 15, 1949 B. szNYcER 2,487,952

POWER TRANSMISS ION Filed Oct. 50, 1948 INVNTHR @wm/fd AT TORNEY Patented Nov. 15,( 1949 Bowan. Transmission Bernard Sznycem New York, N; Y., assignor to Intercity Arrlinc: lJompan-y, Montreal; @Paolucci Canada Application 'October 30, 19998,. Serial'. No.. 57,561

. Ih'Ganada July 1'2, `I94`6 t Claim. I

The invention .relates to improvements yin ypower transmission asdescrifbedv the present `form oi' the` invention..

The objects of the invention are to devise:A a power transmission: for helicopters which the drive shaft toI thefrotorsl is .at right angles to drivef shaft. from the.I power source. and; where thecontrol: swashplate. is: mounted'. below the transmission; to; produce: .a power transmission which will reduce vibration caused. by'the rotors being-connected directly with the to proP vide'. a power transmission which, will .enable the use of.' a. vertical shaft. either:v im ome. piene or in: sections for driving the rotem; to devise'. a power transmission which wilt torque and strain. on the engine and engine drive shaft; to construct a power transmission having the shaft to which the swash. plate. attached rotating at the same speedv as the rotor head; to produce ay power Awlriclnendete positive action between the engine and. the; rotors to produce avpower transmission simplem construction, easy to assemble and having' the various parts` readily accessible for inspection and? quick repair? and generally to provide. `a power transdin'able. in. construction. practical! in koperation and -eiiicient for its purpose.

In that drawings. the. ligure is; as sectional pla view of the power tranemissioner Like numerals of reference indicate correspending parts in the various gures.

Referring to the drawings the spiral bevelipine `ion is indicated` by thenumeral P91 This pinion shaft is made of any suitable metal and of a predetermined size being journalled vin the bevel pinion housing I I by means of the bearings I2, I3, and I4.

The tachometer drive housing I is suitably mounted on the bevel pinion housing II, The tachometer 'drive pinion I6 is securely fitted on the spiral bevel pinion shaft I Il. The seal I1 is tted in this housing I5 and around a portion of the tachometer drive pinion I6 providing a means for retaining a lubricant therein. The tachometer drive gear I8 is made of any suitable material and of a predetermined size being journalled in the tachometer drive housing I5 by means of the bearing I9, and also being journalled in the bevel pinion housing II by means of the bearingZU. The tachometer'shafl-t atltachment 2l is a threaded portion protruding from the bevel pinionhousing `I`I. The' shaft 22 which is a portion of' the drive gear' I'- is. suit'- ably adapted to facilitate malinga connection lwith same; The seal 23 is fitted inthe v bevel pinion housing I f and around' a portion o1" the shaft '22 providing means for retaining'a. lubricant therein.

The bevel pinion housing II is suitably secured to the centre housing 28.

The bevelV gear .25 on the spiral bevel pinion shaft IU engages with the spiral bevel' crown gear 26 providing a meansv of transforming the motion to this crown gear' 26v which is at right angles to the bevel gear 25". The crown gearl 26 is made of any suitablev material and of a predetermined size beingv fixedly .secured to the sleeve 21"..

The centre. housing 218 is. xedl'ysecured to the bevel pinion housing. II and to they bottom hous ing 24.. The sleeve 2T rotatably mounted by means oi the bearing. 29 and 39.' i'n the .bottom housing, Z4., and also, by meansv of the bearings 3| and. .32 in the, centre. housing. 28..

The driven or vertical. shaft.- consists oftwo shaftsectionsv 33and'34, both of which. are hollow. The upper shaft section. 33r has a retainingcollar 33A xedly secured. around theY lower. portion thereon. The upper end of the. lower shaft section v34 is enlargedy at the upper end. thereof. to

over the: lower end. of the. upper shafty section 33. A resilient spacer ring 34A is accommodated withinthe retaining vcollar 33 and the upper end of the lower shaft section. 34 abuts thisresilient spacer ring thereby formingY a. ,flexible and resilient; coupling, betweeny the two shaft sections.`

While. theseI shaft sections 33 and' 33. extend througlrthe` hollow portionA of thersleeve 2:1.l they dolnotzsnpport this sleeve in. any way,` this-being accomplished by means of the bearings 29, 39, 3|, and 32 as previously described.

The sun gear 35 is xedly secured and supported on the sleeve 21. The planetary pinions 31 are rotatably mounted on pins 38. These pins being suitably mounted on the planetary gear cage 36. An internal gear 39 is suitably secured to the upper housing 40 and the centre housing 28. The sun gear 35 engages the planetary pinions 31 rotating the same. The planetary pinions 31 engage the internal gear 39 which is stationary in the housing 28 and 40. As these planetary pinions 31 which are mounted on the planetary gear cage 36 revolve they travel around inside the internal gear 39, thus turning the shaft section 33 with respect to the housings of the power transmission.

The extension housing 4| is of a predetermined size and suitably secured to the upper housing 40.

The shaft section 33 is rotatably mounted by means of the bearing 42 in the extension housing 4| and'also by means of the bearings 43 and 44 in the upper housing 40. The shaft section 34 is rotatably mounted by means of the bearings 45 and 46 in the lower seal housing 41 which, in turn, is suitably secured to the bottom housing 24.

The seal 48 is fitted in the extension housing 4| and around a portion of the shaft section 33. The seal 49 is fitted in the lower seal housing 41 and around a portion of the shaft section 34. These seals 48 and 49 providing means for retaining a lubricant within the power transmis-I sion.

The spiral bevel pinion shaft I0 is provided with a locknut 50 on the outer end thereof, facilitating making a connection with the power source.

The shaft section 34 has a slot 5| towards the lower end of same providing means for connection to a swashplate.

It will be seen from the foregoing that a simple and eilicient power transmission has been devised for helicopters that will eliminate strain and direct vibration with respect to the power source,

What I claim is:

In a power transmission, a center housing having an upper housing and a bottom housing se- 'cured thereto, an extension housing secured to the upper portion of said upper housing, a pinion housing secured to said center .housing and extending outward therefrom at right angles thereto, a bevel pinion shaft extending through said pinion housing, vsaid bevel pinion shaft being hollow throughout the greater length thereof, two outer bearings mounted in said pinion housing and rotatably supporting said bevel pinion shaft, a bevel gear integral with said bevel pinion shaft and located on the inner portion thereof, a vertical shaft consisting of an upper shaft section and a lower shaft section, said upper shaft section and said lower shaft section both being hollow, a retaining collar xedly secured on the outside of said upper shaft section toward the lower end thereof, a resilient spacer-accommodated within said retaining collar on said upper lupper and said lower shaft sections and being clear of the same, bearings accommodated within said center housing and rotatably supporting said sleeve, a bevel crown gear Xedly supported on said sleeve and bein-g engaged by said bevel pinion gear, a sun gear supported above said sleeve and being fxedly secured thereto, a planetary gear cage fixedly mounted on said upper shaft section, a plurality of planetary pinions rotatably supported by said planetary cage and being engaged by said sun gear, an internal gear iixedly secured between said upper housing'and said center housing and being engaged by said planetary pinions as they travel around inside said internal gear, bearings accommodated within the top portion of said extension housing and rotatablysupporting the upper portion of said upper shaft section, an upper seal tted in said extension housing and around a portion of said upper shaft section at the upper end thereof, bearings accommodated within said bottom housing and rotatably supporting said lower shaft section, a lower seal housing secured to the lower portion of said bottom Vhousing and extending around said lower shaft section, a lower seal accommodated within said lower seal housing and engaging the lower portion of said lower shaft section, a tachometer drive housing mounted on said bevel pinion housing at the outer end thereofa tachometer drive pinion xedly secured on said bevel pinion shaft, a tachometer drive gear rotatably supported between a portion of said bevel pinion housing, and said tachometer drive gear being engaged by said tachometer drive pinion, a protruding portion extending from the portion of said bevel pinion housing supporting said tachometer drive gear, a shaft extending outward from said tachometer drive gear into said protruding portion on said bevel pinion housing, and an oil seal fitted in said bevel pinion housing and extending around a portion of said shaft of said tachometer drive gear.

BERNARD SZNYCER.

REFERENCES CITED The following references are of record in the le of this patent:

, UNITED STATES PATENTS Number 

